"Using Rubber Bands as Power" Motion and Force PPT Courseware 2

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"Using Rubber Bands as Power" Motion and Force PPT Courseware 2

Introduce new lessons

1. When we carry water, we feel the downward pull of the bucket on our hands; when we carry a schoolbag, we feel the downward pressure of the schoolbag on our shoulders. Objects have a downward force, which is ______.

2. In the car experiment, the more washers there are, the more ______ the car moves.

3. In this experiment, the magnitude of the pulling force is related to ______.

4. In this experiment, the force that makes the car move is ______.

Almost all motor vehicles in life use wheel drive, that is, the power makes the wheels rotate, and the wheels drive the body forward through friction with the ground.

Preliminary exploration

Install the rubber band driven trolley

The wheels and axle of the experimental trolley are fixedly connected together. When the axle rotates, the wheels rotate together. Wrap a rubber band around the axle of the cart wheel to drive the cart. An axle sleeve is tightly installed on the wheel axle to make it easy for the rubber band to wrap around the axle (a few layers of tape or tape wrapped around the wheel axle can also prevent the rubber band from slipping on the axle).

In-depth research

Study the relationship between the number of turns of the rubber band and the distance traveled by the car

1. Speculate the relationship between the two.

(When the rubber band is wound for one turn, the elastic force produced is small; when it is wound for multiple turns, the elastic force is larger. When the rubber band is wound for one turn, the elastic force acts on the car for a short time; when it is wound for multiple turns, the elastic force acts on the car. )

2. Design experiments to test conjectures.

How to make the car travel further?

——Find a way to increase the length of the rubber band (make a fulcrum for tying the rubber band), find a way to increase the elasticity of the rubber band (install two rubber bands side by side), if the elasticity is too high and the wheels slip, you can increase the weight of the car appropriately...

Experimental requirements

①. Keep an eye on the end point, measure the distance with a measuring tape and fill in the record sheet in time.

② Think while experimenting: When the rubber band is wound one or more times, will the force generated be the same? Does the force of the rubber band act on the car for the same amount of time?

Use rubber bands as power

Within a certain range,

The more turns the rubber band has, the more elastic it will be and the car will travel farther;

The number of turns of the rubber band is small, and its elasticity is small, so the car can travel closer.

Understand how the elasticity of a rubber band is generated

How does the elasticity of a rubber band come about?

Objects such as rubber bands and springs can easily change their shape when acted upon by external forces. When their shape changes, they will generate a force to restore their original shape. This force is called elastic force.

When an object changes shape, it will generate a force that restores its original shape. This force is called ________. ________, ________ and ________ all make use of the elasticity of objects.

1. When an object changes shape, it produces a force to return to its original shape ( ).

A. Gravity B. Pressure C. Elasticity

2. Which of the following objects has elasticity ( ).

A. Stone B. Rubber band C. Opened bow

3. When installing a car driven by a rubber band, wrap the rubber band around the ( ) axis.

A. Front wheel B. Rear wheel C. Both front and rear wheels are fine

4. The power of the rubber band powered car is provided by ( ).

A. Wheel B. Body gravity C. Rubber band

5. To make the rubber band powered car move faster, the following methods are feasible ( ).

A. Increase the number of turns of the rubber band. B. Reduce the number of turns of the rubber band. C. Reduce the number of rubber bands.

6. The direction of the car's movement and the direction of the rubber band winding around the axle ( ).

A. Same B. Opposite C. Irrelevant

7. Within a certain limit, the more wrong codes are hung at the lower end of the rubber band, the elastic force generated by the rubber band ( ).

A. The bigger B. The smaller C. No change

1. A rubber band can be stretched infinitely. The longer it is stretched, the greater the elasticity it produces. ( )

2. A spring that is not stretched also has elasticity. ( )

3. The bent wood is also elastic. ( )

4. The distance traveled by the car is related to the number of turns of the rubber band ( )

5. When wrapping the rubber band, do not wrap it too tightly. ( )

6. The direction of the car's movement is forward, regardless of the direction of the rubber band. ( )

7. Our textbooks will also produce elasticity after deformation. ( )

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For more information about the PPT courseware "Using Rubber Bands as Power for Movement and Force", please click on the PPT tab for "Using Rubber Bands as Power for Movement and Force".

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Update Time: 2024-11-24

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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